SnO<sub>2</sub>-CeO<sub>2</sub>催化剂的合成及其CO氧化性能

摘要

采用共沉淀法制备了SnO₂-CeO₂复合金属氧化物催化剂，通过XRD、TEM、H₂-TPR、CO-TPR等表征手段对催化剂结构和氧化还原性能进行了研究，并考察其CO催化氧化性能。与SnO₂和CeO₂催化剂相比，SnO₂-CeO₂固溶体催化剂具有较小的晶粒尺寸和较大的比表面积。另外，H₂-TPR和CO-TPR结果表明，在H₂和CO的还原气氛下，由于Sn⁴⁺+2Ce³⁺↔Sn²⁺+2Ce⁴⁺氧化还原平衡的存在，SnO₂-CeO₂复合金属氧化物催化剂表面的Sn⁴⁺氧化能力得到大幅度增强。其中，Sn_0.7Ce_0.3O₂催化剂由于具有最大的比表面积和最强的表面Sn⁴⁺氧化能力，从而表现出了最佳的CO催化氧化性能。

	Service

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	Email Alert
	RSS
	作者相关文章
	李静
	柴澍靖
	白雪芹
	李新刚

关键词：催化氧化 SnO₂-CeO₂ CO 表面Sn⁴⁺ 复合金属氧化物

Abstract：

SnO₂-CeO₂ metal oxide composites were prepared by the co-precipitation method. Characterizations of XRD, TEM, H₂-TPR and CO-TPR were used to analyze the structure and redox properties of the catalysts. The catalytic performance of the catalysts for CO oxidation was also investigated. Compared with the SnO₂ and CeO₂ catalysts, the SnO₂-CeO₂ catalysts possessed the smaller crystallite sizes and larger specific surface areas. The H₂-TPR and CO-TPR results showed that the surface Sn⁴⁺ cations over the SnO₂-CeO₂ catalysts have higher reducibility in both H₂ and CO reducing gas due to the redox equilibrium of Sn⁴⁺+2Ce³⁺↔Sn²⁺+2Ce⁴⁺. Among all the catalysts, the Sn_0.7Ce_0.3O₂ catalyst showed the best catalytic performance because of its largest surface area and the highest reducibility of surface Sn⁴⁺ cations.

Keywords： catalytic oxidation； SnO₂-CeO₂； CO； the surface Sn⁴⁺； metal oxide composites

Received 2016-03-21;

Fund:

国家自然科学基金（U1232118）。

Corresponding Authors: 李新刚,E-mail:xingang_li@tju.edu.cn。 Email: xingang_li@tju.edu.cn

About author: 李静(1991-),女,硕士研究生,工业催化专业,现从事环境催化方面的研究。

引用本文:

李静, 柴澍靖, 白雪芹, 李新刚.SnO₂-CeO₂催化剂的合成及其CO氧化性能[J]. 化学工业与工程, 2017,34(6): 1-5

Li Jing, Chai Shujing, Bai Xueqin, Li Xingang.Synthesis of SnO₂-CeO₂ Catalysts and Its Catalytic Performance for CO Oxidation[J]. Chemcial Industry and Engineering, 2017,34(6): 1-5

[1] Xie X, Li Y, Liu Z, et al. Low-Temperature oxidation of CO catalyzed by Co₃O₄ nanorods[J]. Nature, 2009, 458(7239):746-749
[2] Xu J, Deng Y, Luo Y, et al. Operando Raman spectroscopy and kinetic study of low-temperature CO oxidation on an α-Mn₂O₃ nanocatalyst[J]. Journal of Catalysis, 2013, 300:225-234
[3] Chen M, Cai Y, Yan Z, et al. Highly active surfaces for CO oxidation on Rh, Pd, and Pt[J]. Surface Science, 2007, 601(23):5326-5331
[4] Ouyang X, Scott S L. Mechanism for CO oxidation catalyzed by Pd-substituted BaCeO₃, and the local structure of the active sites[J]. Journal of Catalysis, 2010, 273(2):83-91
[5] 陈业娜, 孟明. 焙烧温度对CuO/Co₃O₄-CeO₂催化剂CO优先氧化性能的影响[J]. 化学工业与工程, 2015, 32(2):1-5 Chen Yena, Meng Ming. Effect of calcination temperature on the catalytic performance of CuO/Co₃O₄-CeO₂ catalyst for preferential CO oxidation[J]. Chemical Industry and Engineering, 2015, 32(2):1-5(in Chinese)
[6] 孙敬方, 葛成艳, 姚小江, 等. 固相浸渍法制备NiO/CeO₂催化剂及其在CO氧化反应中的应用[J]. 物理化学学报, 2013, 29(11):2451-2458 Sun Jingfang, Ge Chengyan, Yao Xiaojiang, et al. Preparation of NiO/CeO₂ catalysts by solid state impregnation and their application in CO oxidation[J]. Acta Phys-Chim Sin, 2013, 29(11):2451-2458(in Chinese)
[7] 孙敬方, 张雷, 葛成艳, 等. 固相浸渍法和湿浸渍法制备CuO/CeO₂催化剂及其CO氧化性能的对比研究[J]. 催化学报, 2014, 35(8):1347-1358 Sun Jingfang, Zhang Lei, Ge Chengyan, et al. Comparative study on the catalytic CO oxidation properties of CuO/CeO₂ catalysts prepared by solid state and wet impregnation[J]. Chinese Journal of Catalysis, 2014, 35:1347-1358(in Chinese)
[8] 杨志强, 毛东森, 杨超杰, 等. 制备方法对CuO-CeO₂/ZrO₂催化CO氧化性能的影响[J]. 无机化学学报, 2012, 28(7):1353-1359 Yang Zhiqiang, Mao Dongsen, Yang Chaojie, et al. Effect of preparation method on catalytic performance of CuO-CeO₂/ZrO₂ for CO oxidation[J]. Chinese Journal of Inorganic Chemistry, 2012, 28(7):1353-1359(in Chinese)
[9] Pu Z, Liu X, Jia A, et al. Enhanced activity for CO oxidation over Pr-and Cu-doped CeO₂ catalysts:Effect of oxygen vacancies[J]. The Journal of Physical Chemistry C, 2008, 112(38):15045-15051
[10] Wang X, Xiao L, Peng H, et al. SnO₂ nano-rods with superior CO oxidation performance[J]. Journal of Materials Chemistry A, 2014, 2(16):5616-5619
[11] Li Y, Peng H, Xu X, et al. Facile preparation of mesoporous Cu-Sn solid solutions as active catalysts for CO oxidation[J]. RSC Advances, 2015, 5(33):25755-25764
[12] Bozo C, Guilhaume N, Garbowski E, et al. Combustion of methane on CeO₂-ZrO₂ based catalysts[J]. Catalysis Today, 2000, 59(1):33-45
[13] Cargnello M, Jaén J J D, Garrido J C H, et al. Exceptional activity for methane combustion over modular Pd@CeO₂ Subunits on Functionalized Al₂O₃[J]. Science, 2012, 337(6095):713-717
[14] Liu C, Xian H, Jiang Z, et al. Insight into the improvement effect of the Ce doping into the SnO₂ catalyst for the catalytic combustion of methane[J]. Applied Catalysis B:Environmental, 2015, 176:542-552
[15] 柴澍靖, 李静, 白雪芹,等. 水热法制备SnO₂纳米颗粒的CO氧化性能[J]. 化学工业与工程, 2017, 34(5):19-24 Chai Shujing, Li Jing, Bai Xueqin, et al. CO oxidation performance over SnO₂ nanoparticles prepared with hydrothermal method[J]. Chemical Industry and Engineering, 2017, 34(5):19-24(in Chinese)
[16] Yao X, Xiong Y, Zou W, et al. Correlation between the physicochemical properties and catalytic performances of Ce_xSn_1-xO₂ mixed oxides for NO reduction by CO[J]. Applied Catalysis B:Environmental, 2014, 144:152-165
[17] Yao X, Yu Q, Ji Z, et al. A comparative study of different doped metal cations on the reduction, adsorption and activity of CuO/Ce_0.67M_0.33O₂ (M=Zr⁴⁺, Sn⁴⁺, Ti⁴⁺) catalysts for NO+CO reaction[J]. Applied Catalysis B:Environmental, 2013, 130:293-304
[18] Han X, Xu X, Liu W, et al. CO oxidation on Ta-modified SnO₂ solid solution catalysts[J]. Solid State Sciences, 2013, 20:103-109
[19] Baidya T, Gupta A, Deshpandey P A, et al. High oxygen storage capacity and high rates of CO oxidation and NO reduction catalytic properties of Ce_1-_xSn_xO₂ and Ce_0.78Sn_0.2Pd_0.02O₂-delta[J]. The Journal of Physical Chemistry C, 2009, 113(10):4059-406.
[20] Sellick D R, Aranda A, García T, et al. Influence of the preparation method on the activity of ceria zirconia mixed oxides for naphthalene total oxidation[J]. Applied Catalysis B:Environmental, 2013, 132:98-106